BOOM!, who is selling the issue at the special price of $1, is preparing a second print run of 2,500 copies to cater for the demand. The new edition will feature a variant cover by Timothy Green II and Blond.

Featuring artwork by Manuel Bracchi, Higher Earth centres around an empire formed from hundreds of alternate reality Earths, and follows the adventures of a rogue soldier and his young companion.

BOOM! found similar success with its Fanboys Vs Zombies series when it offered issues of the comic for $1.